Data registration
Ammonit GmbH / 2005 - 2009
27
3.2.1. Frequency distribution of the wind speed
The frequency distribution indicates how often a certain wind speed occurs. The
Data Logger provides 29 wind classes each 1m/s wide. The upper class
contains all averaging above 28 m/s wind speed You get these values as
relative frequency in % for the whole measurement period. This provides the
analytically basis for determining the energy content of the wind and also for the
so-called Weibull distribution which is occasionally used to characterise wind
sites.
The following graph represents an example of frequency distribution of wind
speed. This graph - as well as further pictures shown in this manual - is drawn
with the evaluation software "ALWIN for Windows" (copyright Deutsches
Windenergie-Institut and Ammonit ).
ALWIN "imports" the measurement data of a Data Logger directly to your PC.
Above picture shows the frequency distribution as diagram. ALWIN calculates
the parameter for Rayleigh- and Weibull distribution from the measurement data
(see above curves in the diagram). And it links the data with the power curves of
various wind energy converters. Thus, you get a prognosis of the energy yield,
but keep in mind to consider further influences as hub height and air density.
Summary of Contents for METEO-32
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